Hi,
We are trying to upgrade our application to the latest Telerik UI for ASP.NET AJAX (2025.3.812) and we are experiencing an issue with spell check.
In the latest version words with a ' in them eg "Darren's" are flagged as a spelling mistake as "Darrenss" where the ' is replaced with the letter after it. Even if you click ignore it still replaces the original text with the version with the extra s.
The use of spell check is enforced in our application so this preventing us from upgrading.
You can reproduce the issue on the Telerik spell check demo page here:
https://demos.telerik.com/aspnet-ajax/spell/examples/overview/defaultcs.aspx
Can you please confirm if there is a work around or a fix available?
Thanks
The issue reported previously - Uncaught TypeError: Cannot read properties of null (reading 'className') - is still present if setting the <compilation debug=”true”> in the web.config and EnableScriptCombine="false" in the ScriptManager.
Workaround - Toggle drop zone visibility or enable/disable it, using AsyncUpload OnClientFileUploaded and OnClientFileUploadRemoved events:
<div class="dropfile" style="height: 20px; width: 120px; background-color: red; display: block">
</div>
<telerik:RadAsyncUpload ID="fimFileImport" runat="server" DropZones=".dropfile" MaxFileInputsCount="1"
RenderMode="Lightweight" OnClientFileUploaded="OnClientFileUploaded" OnClientFileUploadRemoved="OnClientFileUploadRemoved" >
</telerik:RadAsyncUpload>
<script type="text/javascript">
function OnClientFileUploaded(sender, args) {
var maxFileCount = sender.get_maxFileCount();
var uploadedFilesLength = sender.getUploadedFiles().length;
if (maxFileCount === uploadedFilesLength) {
$telerik.$('.dropfile').hide();
}
}
function OnClientFileUploadRemoved(sender, args) {
var maxFileCount = sender.get_maxFileCount();
var uploadedFilesLength = sender.getUploadedFiles().length;
if (maxFileCount > uploadedFilesLength) {
$telerik.$('.dropfile').show();
}
}
</script>
Contact email: carlos.diaz@cenace.gob.mx
Accessibility Management Platform (AMP) reports that the Telerik Web Forms ComboBox has an attribute mismatch
This element has a mismatch between the value of its readonly and aria-readonly attributes
The following structure replicates the error
<telerik:RadComboBox ID="RadComboBox1" runat="server" EmptyMessage="Empty Message" EnableAriaSupport="true">
<Items>
<telerik:RadComboBoxItem Text="Item 1" />
<telerik:RadComboBoxItem Text="Item 2" />
<telerik:RadComboBoxItem Text="Item 3" />
<telerik:RadComboBoxItem Text="Item 4" />
</Items>
</telerik:RadComboBox>
Noticed that when using a template to custom define the pager look, the pager gets rendered in a TD and not a TH as expected since the pager is in a THEAD. Could the header pager only be modified to render in TH? This would allow all elements in the header to render the same and help with styling.
While trying to update to latest version of Telerik ASP.Net Ajax, we are getting following exception:
An error occurred while running the wizard.
Error executing custom action Telerik.Web.UI.VSX.Actions.MultiProjectUpdateReferencesAction: System.Runtime.InteropServices.COMException (0x80004005): This reference cannot be removed from the project because it is always referenced by the compiler.
at VSLangProj.Reference.Remove()
at Telerik.VSX.Internal.VisualStudio.VisualStudioThreadHelper.<>c__DisplayClass0_0.<<RunInMainThread>b__0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.VisualStudio.Threading.JoinableTask.CompleteOnCurrentThread()
at Telerik.VSX.Internal.VisualStudio.VisualStudioThreadHelper.RunInMainThread(Action action)
at Telerik.VSX.ProjectConfigurators.ApplicationReferenceManager.RemoveReferences()
at Telerik.VSX.ProjectConfigurators.ApplicationReferenceManager.UpdateReferences()
at Telerik.VSX.Actions.UpdateReferencesAction.UpdateReferences(IProjectWrapUIComponents projectWrap)
at Telerik.VSX.Actions.MultiProjectActionBase`1.Execute(WizardContext wizardContext, IPropertyDataDictionary arguments)
at Telerik.VSX.Actions.MultiProjectUpdateReferencesActionBase`1.Execute(WizardContext wizardContext, IPropertyDataDictionary arguments)
at Telerik.VSX.WizardEngine.ActionManager.ExecActions()
I would request to have the upgrade wizard handle it and show a graceful message instead of throwing the exception as it is doing right now.
Dear Telerik Support. I found another bug related to this one below.
This line of code also causes the same issue.
$find("txtYear").clear();
See attached Console debug output.
It is my opinion that a hot fix needs to be done asap! The work around that Derek posted on May 23rd falls short of the bigger issue. This is a serious matter and needs to be addressed immediately.
Summary
After editing an Excel `.xlsx` file using Telerik RadSpreadsheet and saving it via the default Save option, the saved file becomes corrupted. It no longer opens in RadSpreadsheet (throws an error) and shows a repair warning in Microsoft Excel.
Reproduction Steps
1. Upload an Excel `.xlsx` file to the `ABC` folder on the server.
2. Load the file in RadSpreadsheet via a basic viewer page.
3. Make any small edit (e.g., change a cell’s value).
4. Click the built-in Save option in the RadSpreadsheet toolbar.
5. Attempt to:
- Reopen the saved file in RadSpreadsheet → Error: Object reference not set to an instance of an object.
- Open in Excel → Warning: “We found a problem with some content in ‘filename’. Do you want us to try to recover as much as we can?”
Files Attached
- `Original.xlsx` — Before editing, opens fine in both RadSpreadsheet and Excel.
- `Modified.xlsx` — After saving via RadSpreadsheet, causes errors.
- Screenshot of:
- RadSpreadsheet error :
- Excel repair prompt
Code Snippet :
<telerik:RadSpreadsheet ID="sample" runat="server" Visible="false" style="font-size: 10px;" />
protected void Page_Load(object sender, EventArgs e)
{
string fileName = (string)Session["SelectedFileName"];
SheetLoad(fileName);
}
private void SheetLoad(string fileName)
{
try
{
string filePath = Server.MapPath("~/ABC/" + fileName);
if (!File.Exists(filePath))
{
string errorMsg = "File not found: " + filePath;
ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('File not found!');", true);
return;
}
// Load spreadsheet using Telerik document provider
sample.Provider = new SpreadsheetDocumentProvider(filePath);
sample.Visible = true;
}
catch (Exception ex)
{
string errorMsg = "Error opening file: " + ex.Message + " | File: " + fileName;
ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('Error loading file!');", true);
}
}
**Observation:**
* This only happens for **some files**, especially ones that likely contain advanced Excel features.
* Other simpler files save and reload without any issue.
**Assumption:**
It seems the default save behavior of RadSpreadsheet is **not preserving some Excel structures**, leading to file corruption on save.
"Loading..." text in Combobox with Virtual Scrolling is visible on first set of items loading. It shows first time "Loading..." text. on scrolling it loads items from PageMethods/WebService but "Loading..." text it not visible i.e. because it is first <LI> item so it is not visible. Instead of first <LI> item, it should be at position where it always display while loading more items. same issue is also in telerik demo website : http://demos.telerik.com/aspnet-ajax/combobox/examples/populatingwithdata/autocompletesql/defaultcs.aspx
RadMultiselect control has ClearButton property which should enable displaying the button for clearing all the selected options...
However, eventhough I have this property turned on I don't see any button for clearing the values... I can only go to the "expected" position for the button and then my mouse cursor is changed and after clicking all the values are cleared as expected...
In version 2025 Q2, I am getting the following error message when opening the RadGrid in design mode:
System.NullReferenceException: Object reference not set to an instance of an object. at Telerik.Web.UI.Licensing.TelerikLicense.get_CurrentHost() at Telerik.Web.UI.Licensing.TelerikLicense.get_IsLicenseValid() at Telerik.Web.UI.RadGrid.Render(HtmlTextWriter writer) at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) at System.Web.UI.Design.ControlDesigner.GetDesignTimeHtml()
If you click in the table (not the editor) and select Cell Properties > the wizard will display (highlight) the cell you selected in the table is it expected that when selecting table properties it always default to the left side first box but when selecting cell properties it will show the current cell which we are in.
video link:- https://jam.dev/c/c1cdf56c-53ab-4218-8774-65907b3efd6d
Business Need - User Story Terminology:
As a Telerik Support Specialist, I would like our programmers to incorporate new code which will treat hyphens as if it were a space upon ExportToPdf() so that we gracefully handle for scenarios where a very long word with a hyphen will wrap to the next line instead of overlapping other content.